According to Trip.com latest record on status for Frontier Airlines flight F9621 from Austin to Denver (AUS-DEN):
Flight F9621 has been canceled. Please refer to the airline or airport for the most up-to-date information.
AUS-DEN
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Cancelled
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Austin(AUS)
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Scheduled:
Austin-Bergstrom International Airport
2h 24m
Denver(DEN)
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Scheduled:
Denver International Airport
Check-in Counter
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Boarding Gate
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Arrival Gate
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Baggage
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Flight status powered by VariFlight.VariFlight. For real-time updates, follow airport displays or contact your airline directly. If this is not your flight, you can browse more options for flights from Austin to Denver to find your schedule.